I have a lot of mattress grade foam has anybody got any ideas what I can do with it to make some money?

I have a lot of used mattresses but the covers are damaged so they are of no use to me but the foam inside is like new and it seems a waste to just throw it in the bin. I'm trying to think of other uses for the foam to try and maybe make a few quid in the process but I'm struggling for ideas, has anybody got any ideas of what I could do with the foam? Thanks.